Executive Board Members
Vivianne Studler
Chairman
Viviane was born in Probolinggo, East Java. She has been very active since her youth, organizing various activities in churches, schools and on campus. She is a certified Computer Analyst (as Programmer and System Analyst).
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She grew up in a catholic family, relocated to Switzerland in 1995, where she integrated very fast.
On 9th November 2002, she gave up her life to Jesus, took Him as her Lord and Saviour, being the most important turning point in her life.
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From 2004 until 2012, she was employed in the Chinese School in Winterthur, Switzerland. From 2012, until today, she has the privilege of working in the Church Arche Winterthur, earning the trust of the believers at the church ‘Arche Winterthur’, to serve people and God.
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She was elected as Chairman Perki Swiss for period 2022-2026. She has many hobbies including singing, arranging flowers, cooking and organizing different events. Wherever she is, her heart´s desire is to serve God, to share His Word with others and being a role model through her life and testimonials, especially among the Indonesians living in Switzerland.
Alfonco Sinaga
1st Vice Chairman
Alfonco was the former General Chairman of Perki Swiss who served for two consecutive periods (2014-2022). Born in Sipangan Bolon, North Sumatra. He grew up in the house of his grandparents, a priest, until the age of 12 (graduated from elementary school). Since childhood, he has been educated to devout worship and care for others.
As a teenager, he was active in the church's youth. In 2001, he was appointed as Chairperson for Indonesian Youth Pentecostal Church in Jabotabek. Then as Sintua in 2007 for the Indonesian Pentecostal Church (GPI) in Bekasi Kota. That same year, he moved to Switzerland with his family to take up a new job at a multinational energy company.
The Alumni of Electrical Engineering from University of North Sumatra Medan 1999, now serves as the 1st Vice Chairman of Perki Swiss. A person who loves singing and socializing has a vision that one day, the Indonesian people in Switzerland will return to devout worship as they did in Indonesia.
Enrico Timisela
2nd Vice Chairman
Enrico was born and raised in Sulawesi, Indonesia, where he grew up in a warm and faith-filled Christian family. His parents were both church elders, and their example of dedicated service helped shaped the person he is today.
He firmly believes in an inclusive approach to society, celebrating cultural and religious diversity as a strength rather than a difference.
In 2012, Enrico relocated to Switzerland, embarking on a new chapter of his life in Europe. He has since built a solid and dedicated professional career in the Information Technology sector, contributing his expertise and passion for technology to the organisations he serves.
Since settling in Switzerland, Enrico has also embraced the country's remarkable landscape and outdoor culture. His favourite pastime is hiking in the Alps exploring mountain trails and summits that continue to inspire and recharge him.
Vilona Christy Sembiring
General Secretary
Vilona was born in Padang, west Sumatera. She grew up in Catholic family with parents who are members of the Church Council. She has been active in church since she was little, being an altar girl and organist. Her hobbies are reading and swimming.
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In 2005 she went to Australia to finish high school and university. She studied Commercial Law and Marketing. She met her future husband in Sydney, got married in 2012 and moved right away to Switzerland. By the grace of God, they are blessed with a son who was born in 2020.
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She hopes that by being part of Perki, she can serve others as exemplified by Jesus and help others as God always helps her in any situation.
Joyce Siahaan Sentenac
Deputy General Secretary
Joice is a Christian counselor specializing in intercultural marriage. She holds a degree in Management and a Master’s degree in Theology. Her work focuses on guiding and supporting families through counseling, particularly in navigating both the challenges and the blessings of multicultural relationships.
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Married to her French husband, they are blessed with two children. Through her personal and professional journey, Joice has developed a deep understanding of cross-cultural family life and is passionate about helping couples build strong, Christ-centered families.
In addition to her counseling work, she also enjoys introducing and sharing Indonesian culture and arts, believing that cultural heritage can be a meaningful bridge that connects communities and strengthens mutual understanding.
She is deeply committed to serving with compassion, integrity, and humility. She actively contributes to the spiritual growth and unity of the Indonesian Christian community.
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In addition to her role as Deputy Secretary General of Perki Swiss, she is actively involved in her local church, where she serves as a Sunday School teacher. She also enjoys participating in various community activities and volunteering in different ministries and social initiatives.
She believes that every act of service, no matter how small, can become a blessing for others. Through faith, love, and unity, she hopes to contribute to strengthening the community and reflecting God’s grace in everyday life.
Jonetta Hirsig
General Treasurer
Joneta was born in Toli-Toli, Central Sulawesi, Indonesia. She was baptized at Bukit Zaitun Church in Toli-Toli.
At the age of 10, she moved to Bau-Bau following her parents, who were relocated there for work. She completed her elementary school and junior high school education in Bau-Bau.
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Later, her parents were reassigned to Makassar, where she completed her senior high school education at St. Dominikus Catholic High School in 1988. She then continued her studies at Hasanuddin University, majoring in Sociology at the Faculty of Social and Political Sciences.
During her university years, she was quite active in student organizations within the Sociology department.
After completing her education, she worked at a private company, PT Lumbung, which was involved in property development and telephone installation services.
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She was married in 1999, with the church blessing and civil registration taking place at Bethania Church in Makassar, where she and her family worshipped and were active members of the congregation.
Before her marriage, she was actively involved in the youth fellowship, serving in youth ministry and participating in the church choir.
Today, she lives in Neuchâtel, Switzerland, with her beloved husband and their two daughters. She works as a childminder, providing home-based childcare for young children. In her role, she cares for children during the day, preparing meals for them and helping with their daily routines, including accompanying them to and from school when needed. Through her warm and attentive care, she creates a safe and nurturing environment for the children entrusted to her.
Dyah Vasquez
Deputy General Treasurer
Dyah was born in Balikpapan, East Kalimantan, Indonesia. She grew up in a Christian family and converted to Catholic faith in 1998 after the Virgin Mary appeared in her dream.
She spent her early education from kindergarten through junior high school at VIDATRA in Bontang. She later attended SPK Catholic Boarding School in Samarinda for her hight school education. She holds both a Bachelor’s and Master’s degree in Law from Universitas 17 Agustus 1945 Samarinda.
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Before relocating to Switzerland in 2020, Dyah was actively involved in church life in Indonesia. She served as a soloist and choir member at St. Maria Cathedral Samarinda and St. Markus Church in West Kutai.
In mid-2007, she experienced a profound spiritual moment when she received what she describes as a miracle from Jesus that transformed the direction of her life.
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Professionally, she worked as an Operational and Service Planner at Halliburton Indonesia from 2003 to 2007. She later served as a Financial Analyst and Auditor at BAPPEDA West Kutai from 2008 to 2017.
She married a Spanish man in 2020 and has been living in Switzerland since then. With a warm heart and a strong professional foundation, she works as a dedicated childminder with over five years of hands-on experience nurturing and supporting young children during their most important developmental stages. She is passionate about creating safe, engaging, and joyful learning environments and believes that every child deserves patience, encouragement, and the freedom to grow at their own pace.
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In 2026, she was elected as Deputy General Treasurer of Perki Swiss and entrusted to lead the Sunday School Commission for the 2026–2030 period.
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Currently, she continues to expand her skills by studying Digital Design as well as German, Spanish, and Japanese.
In her free time, she enjoys movies, comics, home cooking, karaoke, handicrafts, video and photo editing, and scrapbooking.